I like the varies images you use in your poem and the contrasts you set up. A few thoughts ...

In line 3, you use "greed" as a verb - which it is not. I think "grub" would work better here.

In line 5, you say "hunger, thirst, death, alone." The first three words are nouns, the fourth an adjective. I think "loneliness" would work better here.

In the line where you say "witness the hardships they go through," you might change "go through" to "endure."

Then, a couple lines later, where you say "the feelings they endure," I would change "endure" to "experience" because we don't usually talk of enduring feelings.

In the next line, you should use the plural word for crisis - "crises" - and maybe change "surpass" to "overcome," because we usually talk of overcoming a crises, but surpassing a goal.

I'm confused by your last two lines - do you mean the millions suffering from poverty? Also, an "infinity amount" doesn't make sense - you might say "an infinite number of eyes, shedding tears." With eyes, you need to use "number," not "amount."

Finally, I would suggest adding some more punctuation to your poem to aid the reader with comprehension. I find commas and periods helpful in a poem when they are appropriate.